"Nashville was working on a trade and its [sic] believed several deadlines passed before Flyers grew tired of waiting," Dreger tweeted. "Weber signed offer sheet."

Weber is one of the most coveted players in this summer's NHL free agency period. The 6-foot-4, 234-pound defenseman also brings a scoring touch to the blue line, having recorded 19 goals and 30 assists last season.

If Nashville does not match the offer sheet, the Flyers would have to give up a significant haul of draft picks - possibly as many as four first-round selections.

"I'm told a number of teams were in on a possible Shea Weber trade," Dreger tweeted. He then followed that up by tweeting: "I may have made an error on compensatory picks. Depending on aav, it could be 2 firsts, 2nd and a 3rd round pick if Preds don't match."

The "aav" refers to a player's average annual value, which translates to the salary cap hit a team takes from the player's contract.